1. A 150 W immersion heater is used to keep the water in a large beaker boiling under standard atmospheric pressure. In 5 minutes, 16 g of water boils away. Neglect any heat loss to surroundings. (a) Find the specific latent heat of vaporization of water, I. A student puts a small metal sphere in the boiling water. After a few minutes, the sphere is quickly transferred to a polystyrene cup containing 100 g of water at a temperature of 20 °C. The cup of water is stirred gently and its highest temperature attained is 22 °C. Given: specific heat capacity of water-4200 J kg-¹ °C- (b) Estimate the heat capacity C of the metal sphere. (e) In fact the sphere has carried with it some boiling water to the cup of water. Referring to this fact, explain whether the true value of C is higher or lower than the value calculated in (b).

1. A 150 W immersion heater is used to keep the water in a large beaker boiling under standard atmospheric pressure. In 5 minutes, 16 g of water boils away. Neglect any heat loss to surroundings. (a) Find the specific latent heat of vaporization of water, I. A student puts a small metal sphere in the boiling water. After a few minutes, the sphere is quickly transferred to a polystyrene cup containing 100 g of water at a temperature of 20 °C. The cup of water is stirred gently and its highest temperature attained is 22 °C. Given: specific heat capacity of water-4200 J kg-¹ °C- (b) Estimate the heat capacity C of the metal sphere. (e) In fact the sphere has carried with it some boiling water to the cup of water. Referring to this fact, explain whether the true value of C is higher or lower than the value calculated in (b).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

1. A 150 W immersion heater is used to keep the water in a large beaker boiling under standard atmospheric
pressure. In 5 minutes, 16 g of water boils away. Neglect any heat loss to surroundings.
(a) Find the specific latent heat of vaporization of water. I.
A student puts a small metal sphere in the boiling water. After a few minutes, the sphere is quickly transferred
to a polystyrene cup containing 100 g of water at a temperature of 20 °C. The cup of water is stirred gently and
its highest temperature attained is 22 °C.
Given: specific heat capacity of water-4200 J kg-¹ °C-
(b) Estimate the heat capacity C of the metal sphere.
(c) In fact the sphere has carried with it some boiling water to the cup of water. Referring to this fact, explain
whether the true value of C is higher or lower than the value calculated in (b).

(d) In order to reduce the error contributed by the polystyrene cup, another student suggests repeating the
measurements using a copper cup of similar shape and size. Explain whether the suggestion is justified.

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